Mold for forming concrete pipes.



P- B. JAGGER.

MOLD FOR FORMING CONCRETE PIPES.

APPLICATION FILED MAR-4,1911.

Patented Oct. 26, 1915.

4 SHEETS-SHEET 1.

II/IIIIIIIIIIIIIIIIIIII COLUMBIA PLANOGRAPH co., WASHINGTON, n, c.

P. B.JAGGER. MOLD FOR FORMING CONCRETE PIPES. APPLICATION FILEDMAR-4.1911.

Patented Oct. 26, 1915.

4 SHEETSSHEET 2.

2%?! use KZMMM COLUMBIA PLANOUR A P l-l COHWASHIPIGTON, n c.

P. B. JAGGER MOLD FOR FORMING CONCRETE PIPES.

Patented Oct. 26, 1915.

4 SHEETS-SHEET 3.

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P. B. JAGGER.

MOLD FOR FORMING CONCRETE PIPES.

APPLICATION FILED MAR. 4. 1911.

,1,15?,97, Patented Oct. 26, 1915.

4 SHEETSSHEET 4- COLUMBIA PLANOCIRAPH IO-,WASHINGTON, D c.

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PETER BUR-D JAGGER, OF LONDON, ENGLAND, ASSIGNOR T0 QUEBEC SAVINGS ANDTRUST COMPANY, OF MONTREAL, CANADA.

MOLD FOR FORMING CONCRETE PIPES.

inmost.

Y Application filed March 4, 1911..

To all whom, it may concern Be it known that I, PETER BURD JAGGER,

' a subject of His Majesty the King of England, residing at CarltonStudios, Carlton Vale, Maida Vale, London, N. England, have inventedcertain'new and useful Improvements in Molds for Forming Concrete Pipes,of which the following is a specification.

This invention relates to the manufacture of pipes, particularly sewerpipes, of concrete or ferro-concrete by introducing an artificialconglomerate composed of some hard substance termed the aggregate and acementing material called the matrix into a mold longitudinally thereof,andit hasfor its object to provide for this purpose an improvedconstruction of sheet metal mold comprising a contractile'core, an outerexpansible horse-shoe shaped casing of sheet metal having longitudinaledges which form the inlet opening arranged in a horizontal plane andwhich whenreleased springs outwardly and in opening acts through itssides acting as lifting supporting members to automatically bodilyseparate and free itself from the pipe and take the weight of the casingoff the back of the pipe, end plates to which saidcore and saideXpansible C357. ing are remo-vably secured, bearing surfaces on thefacing sides of the said plates'said bearing surfaces following thecontour of the exterior of the pipeandbeing adapted to permit theexpansible casing to so separate and free'itself from the pipe when saidcasing is released, said end plates being each provided with a centralopening within which the said core is adapted to be expanded, and meansfor holding said expansible casing in fixed relation to said core and influid tight relation to said end plates. With such a mold I am enabledto produce, forexample, a pipe havinga flat baseand'a spigot andfaucetcomplete,with a minimum amount of labor, it being. only necessary afterassembly of the .mold a parts to, feed and pack the conglomerate thereinuntil the mold is completely filled. Inthis way I can insure theproduction of pipes that are intcriorly and exterior-1y uniform andidentical such as cannot be obtained in cases Where the inner core is ofa yielfdingmaterial and adapted to be inflated as has been-proposed.

' By arranging a temporary addition to'the mold to form a continuationof the casing Specification of Letters Patent.

Patented @613. 26, 1915. .Serial No. 612,393.

adjacent to the admission opening when the casing is shaped to produce abase, the depth of the base may be increased at will.

An important feature of the invention is the utilization of jointformers, producing the spigot and faucet ends as the means for retainingthe outer casing of the mold in its In an advantageous form of the moldthe outer casing is made to spring outward slightly to clear the pipewhen the bolts detachably securing the same to the end plates arereleased. The attaching bolts are preferably hinged to the side of theouter casing and arranged to swing into notches formed 1 in theendplates.

To make the invention the better understood reference is had to theaccompanying drawings, wherein,

Figure 1, is an end sectional elevation of a circular pipe moldconstructed. under the present invention, the section being taken on theline II of Fig. 2 and looking in the direction of the arrows. Fig. 2 isa side sectional elevation of the mold on the line II-II of Fig. 1.Figs. 3 and at are respectively plan and side views of the wedge shapedslide or key employed for expanding and circumferentially completing theinner casing of the mold. Figs. 5 and 6 are detail views to a largerscale illustrative of the pipe joint formers. Fig. 7, is a similar andsectional view to Fig. 1 illustrating the application of the inventionto the manufac- 9 ture of egg-shaped pipes. Figs. 8 and9 are plan andside views of the bolts for securing the outer casing and end plates ofthe mold together. Fig. 10 is a bottom view of Fig. 1.

a designates the inner casing or core of i the mold, which may be ofsteel plate bent to a cylindrical form, as shown in Fig. 1, or to anegg-shaped form, as shown in Fig. 7, according to the shape of the pipeto be made. This inner casing or core is arranged circumferentiallydiscontinuous along a line parallel to 'the longitudinal axis of themold, in order that it may be circumferentially expanded throughout itslength, as by means of a suitable wedging action. The

location of this line of separation of the inner casing or core duringthe manufacture of the pipe will generally be arranged correspondinglyto that side ofthe pipe which will be uppermost in use. The arrangementof the inner casing or core is such that when, after having beendistended, the distending means is removed, the inner casing willcontract somewhat to facilitate its withdrawal slide or wedge c is madeto a curvaturecorresponding to the desired complete curvature of thecasing when; distended by the wedge, and is rabbeted along thelongitudinal edges to fit over the edges d, (Z of the interrupted casinga, and under and between longitudinal guides e, .6 attached to thecasing (1 adjacent to the edges d, al In order to avoid damaging theslide by hammering it into position its ends may be protected by shieldssuch as is indicated by 0 Figs. 3 and 4.

To fit over the ends of the casing a as shown in Fig. 2, end plates 7, fare provided. These end plates have flanges g, g shaped to serve asmaleand female joint formers respectively, that designated 9,

forming the female joint, and g the male joint. The facing sides of theend plates are recessed to form abutting shoulders h,

72? for the ends of the outer casing, and notches dare formed around theend plates for receiving bolts secured to the outer casing for fasteningthis andthe end plates together The outline of the end plates 7, f isarranged to follow the shape in cross sec-' tion of the inner casing a,except at that portion of the completed mold which will correspend withthe foot of the pipe, at which portion the outline of the end-plates iscorrespondingly changed as shown in Figs. 1 and 7. The abuttingshoulders h, k follow the outline of'the end plates to insure a corresponding outline of the outer casing when this is positioned.

The outer casing j is formed by a channel shaped bent plateadvantageously of steel, which may bestiffened along its horizontal andvertical edges as by angle irons j Normally the outer casing j,corresponds only approximately to the outline of the abutting shouldersh, M, 2'. c. it is arranged to spring outwardly somewhat when it isdisconnected from the end plates in order that it shall clear the pipemade within it. To secure the casing j and the end plates together, aconvenient arrangement consists in hinging a number of screw bolts 7?,corresponding to the number of notches i in the end plates, to the outercasing, at each end. As shown the bolts are'hinged to brackets Z rivetedto the casing and are each provided with an eye nut m. lVith thisarrangement the bolts can be readily swung into the notches '11 andsecured by the nuts m, thereby securely fastening the outer casing andthe end plates together. To facilitate removal of the outer casing jfrom the pipe when made, lifting handles a are provided at each side asshown in Fig. 1.

When a depth of the pipe base is desired greater than that normallyallowed for by the mold side and end boards forming respectively acontinuation of the outer casing j and the end plates f, 7, can beutilized to that end. To contract the outer casing when bolting this tothe end plates, a clamp may be used, while for long pipes, transverseconnecting bars will advantageously be secured at intervals'to thelongitudinal edges of the outer casing, in order to avoid springingoutwardly intermediate of the end plates especially during the packingof the conglomerate in the pipe chamber.

With a mold according to this invention I find I am able to manufacturepipes of an artificial conglomerate with greater facility and withbetter results than has obtained with molds heretofore employed.

vHaving now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed I declare thatwhat I claim is 1. A pipe mold comprising a contractile core, an outerexpansible horse-shoe shaped casing of sheet metal having longitudinaledges which form the inlet opening arranged in a horizontal plane andwhich when released springs outwardly and in opening .acts through itssides acting as lifting supporting members to automatically bodilyseparate and free itself from the pipe and take the weight of the casingoff the back of the-pipe, end plates to which said core and saidexpansible casing are removably secured, bearing surfaces on the facingsides of said plates, said bearing surfaces following the contour of theexterior of the pipe and being adapted to permit the expansible casingto so separate and free itself from the pipe when said casing isreleased, said end plates being each provided with a central openingwithin which the said core is adapted to be expanded, and means forholding said expansible casing in fixed re lation to said core and influid tight relation to said end plates.

2. A. pipe mold constituting a self-contained unit comprising a core; anouter expansible casing of sheet metal acting as one integral unit, andhaving longitudinal edges which form the inlet opening arranged in ahorizontal plane and which when released springs outwardly to clear thepipe from the mold; end plates each provided With a central openingWithin which the contractile core is adapted to be expanded; bearingsurfaces, following the contour of the exterior of the pipe, provided onthe facing sides of said end plates; and fastening means comprising aseries of screwed shanks pivotally connected to the casing and adaptedto engage a corresponding series of slots provided around the outerportions of the end plates and to be held therein by bolts (9%) Wherebyalso the edges of the casing are drawn against the end plates With apressure producing substantially a liquid tight joint and the parts ofthe mold are rigidly assembled.

In testimony whereof I aflix my signature in presence of two Witnesses.

PETER BURD JAGGER. Witnesses:

S. V. BARNES, L. GOULSON.

Women of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents Washington, D. 0.

